I to die, and you to live. Which is better God only knows.

Let no-one ignorant of geometry enter. Said to have been inscribed above the door of Plato's Academy.

May I deem the wise man rich, and may I have such a portion of gold as none but a prudent man can either bear or employ.

Putting the shoe on the wrong foot.

Arithmetic is a kind of knowledge in which the best natures should be trained, and which must not be given up.

When a person meets the half that is his very own, whatever his orientation, whether it's to young men or not, then something wonderful happens: the two are struck from their senses by love, by a sense of belonging to one another, and by desire, and they don't want to be separated from one another, not even for a moment.

Let no one destitute of geometry enter my doors.